| 2024年 | 2025年 | 平年値 | |
| 5-19 | 20.1 | 20.2 | 19 |
| 5-20 | 19.6 | 20.6 | 19 |
| 5-21 | 19.7 | 21 | 19.1 |
| 5-22 | 19.4 | 20.9 | 19.6 |
| 5-23 | 19.5 | 21.3 | 19.8 |
| 5-24 | 19.9 | 21.3 | 20 |
| 5-25 | 20.3 | 21.4 | 20.1 |
| 5-26 | 21.4 | 21.4 | 20.3 |
| 5-27 | 21.5 | 21.3 | 20.1 |
| 5-28 | 21.9 | 21.5 | 20 |
| 5-29 | 22 | 21.8 | 20.3 |
| 5-30 | 21.8 | 21.4 | 20.5 |
| 5-31 | 21.6 | 21.2 | 20.9 |
| 6-1 | 21.3 | 20.4 | 21 |
| 6-2 | 20.2 | --- | 21.2 |